package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
@Component
public class RedisIdWorker {
    private static final long BEGIN_TIMESTAMP=1640995200L;
    private static final int COUNT_BITS=32;
    private final StringRedisTemplate stringRedisTemplate;
    RedisIdWorker(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate=stringRedisTemplate;
    }
    public long nextId(String keyPrefix){
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp= nowSecond - BEGIN_TIMESTAMP;

        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));

        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);

        return timestamp<<COUNT_BITS|count;

    }

}
